Lesson 2 reviewer

LESSON 2 -EMERGING AND RE-EMERGINGINFECTIOUS DISEASESWhat is a disease?It refers to conditions thatimpair normal tissue functions.However, there are fundamentallydifferent causes for each of thesediseases.What is an infectious disease?A disease caused by theinvasion of a host by agents whoseactivities harm the hosts tissues (thatis, they cause disease) and can betransmitted to other individuals (that is,they are infectious).Are both infectious and diseasesynonymous? NO. An infection results when apathogen invades and begins growinginside a host. Meanwhile, a diseaseresults only and if when, a consequenceof the invasion and growth of apathogen, tissue function is impaired.Nature of Infectious Diseases Microorganisms that are capable ofcausing disease are called pathogens.But, it is important to note that not allmicroorganisms cause disease.What are the microbes that cause infectiousdiseases? Bacteria Virus Fungi Protozoan Helminths PrionsNature of Infectious DiseasesIn order to cause disease, the pathogen must beable to; enter the host body, adhere to specific host cells, invade and colo ...


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